Create an Outlook profile that can connect to the problem mailbox.[If you work on your own mailbox, you can skip this].

Run Mdbvu32.exe. Select the following three options and click OK: MAPI_FORCE_DOWNLOAD, MAPI_EXPLICIT_PROFILE, MAPI_NEW_SESSION

Make sure that the profile you have created in Step 2 [or your default profile] is selected. Click OK.

Click MDB -> OpenMessageStore.

Make sure the problem mailbox is selected and click Open.

Click MDB -> Open Root Folder.

Double-click “IPM_SUBTREE” in the left list (if for some reason you don’t see this double click each entry in the top/left until you get a folder list.)

Double-click the Calendar.

Click the “Call Function” button.

Click the “SetProps” button.

Make sure the “PR_Display_Name” is selected from the PropID list. Change its name to <whatever> in the textbox below and click the ”Add” button. You will see that the change action is added to the list. Click the “Call” button on the right-top corner to apply the change.

4. Click Close until you drop out of the windows, then close the MDBVU utility and OK to the logoff. From: To:

You may need to close and reopen Outlook to refresh the folder name.

And voilà:

I just verified this to work on MS-Outlook 2007 against MS-Exchange 2007 (and assume it to work on stand-alone PST files also), and added the screenshots to clarify this. My thanks go to user traval and MS for the heavy lifting (although I wish MS would make my lifting still easier).